How much does a BMW 745i engine replacement cost in the UK?

A reconditioned N62B44A engine typically costs £3,500–£6,500 supply only, with used units available from £1,500–£3,500. Fitting adds £2,000–£3,000. Use our calculator for a figure specific to your car. Main dealer replacement is no longer available - specialist rebuild is the only option.

Is the BMW 745i engine reliable?

The N62 is a refined and smooth V8, but it has well-documented weaknesses. Valve stem seal failure is the defining issue - it causes excessive oil consumption and blue smoke. Oil leaks (valve cover, timing cover, alternator bracket) and cooling system failures are also common. With preventative maintenance, the engine can be reliable, but these issues are expensive to fix.

What are the common problems with the BMW 745i?

Valve stem seal failure (excessive oil consumption, blue smoke), oil leaks (valve cover gaskets, timing cover gaskets, alternator bracket gasket), cooling system failures (water pump, thermostat), and VANOS/Valvetronic malfunctions. The valve stem seals are the single biggest concern.

Is it worth replacing a BMW 745i engine, or should I scrap the car?

745i values range from £2,000–£8,000 depending on condition. A £3,500–£6,500 reconditioned engine can be 40–80% of the vehicle's value - apply the 70% BMW scrap threshold. If the car is a cherished example with good bodywork and interior, replacement may be worthwhile.

How do I find my BMW 745i engine code?

The engine code is N62B44A - it's the only engine used in the E65/E66 745i and 745Li (2001–2008). You can find it on the VIN plate, in the vehicle documentation, or on a label on the engine itself. Production ended in 2008.

Can I repair the N62 valve stem seals, or does the engine need replacement?

The valve stem seals can be replaced without removing the cylinder head, using specialist tools. Replacement costs £2,500–£4,500. It's a labour-intensive job, but far cheaper than a full engine replacement (£3,500+). If you ignore the issue, the catalytic converters will be damaged by oil burning, and eventually the engine may suffer from oil starvation.

BMW 7 Series 745i2001–20084.4-litre N62 V8

BMW 745i Engine Replacement — Compare Prices & Get Quotes

The 745i is powered by BMW's first N62 V8 - a 4.4-litre naturally aspirated engine producing up to 333 hp. It's a refined and smooth powerplant, but one plagued by valve stem seal failure and a host of oil leaks. Get quotes from UK specialists for reconditioned, rebuilt and used units today.

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BMW 745i Engines - from £1,500 to £8,500Code: N62B44A

BMW 745i Engines - from £1,500 to £8,500· Code: N62B44A

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The 745i THROUGH TIME - Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 745i Engine Replacement Costs

Supply Only£3,500–£6,500

Fitted (Indie)£5,500–£8,500

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,500–£3,500£3,000–£5,0001–6 monthsBudget priority; lower‑mileage examples

Reconditioned Engine£3,500–£6,500£5,500–£8,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£5,000–£8,500£7,000–£10,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer NewN/A - no longer availableN/A-N/A - specialist rebuild only

Figures above reflect the current 745i market. Used N62 engines are increasingly scarce. Reconditioning costs are high due to the engine's complexity. Main dealer replacement is no longer available - specialist rebuild is the only option.

Labour estimate: Fitting a 745i engine typically takes 14–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The N62's complexity makes it a specialist job.

→ Compare 745i engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Valve Stem Seal Failure

Symptoms: Blue smoke on cold start, puff of smoke after idling, excessive oil consumption (1L per 1,000 miles or more), visible smoke when accelerating from a standstill

Typical mileage: 80,000–130,000 miles

Repair cost: £2,500–£4,500 (valve stem seal replacement - specialist tools required)

Replacement cost: £3,500–£6,500 (if oil starvation causes bottom-end damage)

🔴 Immediate - the N62's valve stem seals are the single biggest weakness of this engine

Our recommendation:

The N62's valve stem seals are the engine's Achilles' heel. BMW specified an oil change interval that was too long for the N62, which hardened the seals, causing them to leak. Oil leaks past the seals into the combustion chamber, leading to blue smoke and heavy oil consumption. Replacement is expensive but well-understood by specialists. Many owners live with the oil consumption, but eventually the catalytic converters will be damaged. If you're buying a 745i, budget for this work or accept the oil top-ups.

Read the full valve stem seal failure guide

1. Valve Stem Seal Failure

Symptoms: Blue smoke on cold start, puff of smoke after idling, excessive oil consumption (1L per 1,000 miles or more), visible smoke when accelerating from a standstill

Typical mileage: 80,000–130,000 miles

Repair cost: £2,500–£4,500 (valve stem seal replacement - specialist tools required)

Replacement cost: £3,500–£6,500 (if oil starvation causes bottom-end damage)

🔴 Immediate - the N62's valve stem seals are the single biggest weakness of this engine

Our recommendation:

Read the full valve stem seal failure guide

2. Oil Leaks (Valve Cover, Timing Cover, Alternator Bracket)

Symptoms: Oil spots under the car, burning oil smell from the engine bay, low oil level warning, visible oil residue on the engine block

Typical mileage: 60,000–100,000 miles

Repair cost: £500–£1,800 (gasket replacement - varies by location)

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

The N62 is notorious for oil leaks. Common leak points include valve cover gaskets, upper timing cover gaskets, and the alternator bracket gasket. These leaks can be expensive to fix due to the labour involved. Check for oil spots regularly and investigate any drops in oil level. Ignoring oil leaks can lead to low oil pressure and eventual engine damage.

Read the full oil leak guide

3. Cooling System Failures (Water Pump, Thermostat)

Symptoms: Overheating, coolant loss, temperature gauge fluctuating, heater not working properly, steam from the engine bay, warning light

Typical mileage: 60,000–100,000 miles

Repair cost: £500–£1,200 (water pump or thermostat replacement)

Replacement cost: £3,500–£6,500 (if overheating causes head gasket or engine damage)

🔴 Immediate - overheating on an N62 can be catastrophic

Our recommendation:

The N62's cooling system is a known weak point. The water pump can fail, and the thermostat can stick open or closed. Overheating is the leading cause of cylinder head damage on these engines. Replace the water pump and thermostat preventatively at around 80,000 miles. Check coolant levels regularly and investigate any drop immediately. A failed water pump can destroy the engine in minutes.

Read the full water pump failure guide

Weighing Your Options?

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745i - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

745i - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseValve stem seals✅ Yes£2,500–£4,500Expensive but well-understood; specialist tools allow replacement without removing cylinder headOil leaks (valve cover, timing cover)✅ Yes£500–£1,800Labour-intensive but straightforward; catch before oil starvationWater pump failure✅ Yes£500–£1,200Preventative replacement at 80k miles - cheaper than an engineVANOS/Valvetronic failure✅ Yes£800–£2,000Specialist repair or rebuild; well-understood by BMW specialistsTiming chain failure (rare)❌ Usually NoEngine replacementIf chain jumps and valves hit pistons, replacement is the only option

Buying This 745i? Check These First

Buy If

Documented valve stem seal replacement - the defining issue on the N62
Evidence of cooling system maintenance - water pump, thermostat and coolant changed
Full service history with frequent oil changes (not the extended BMW interval)
A well-maintained example where the previous owner understood the N62's needs

Avoid If

No proof of valve stem seal work - you're buying a known risk
Blue smoke on cold start or after idling - valve stem seals are failing
Oil spots under the car without a clear diagnosis - oil leaks are expensive to fix
Poor service history - the N62 is unforgiving of neglect
Any engine warning light without a clear diagnosis

Closing Verdict

The 745i is a genuinely desirable luxury saloon - but the N62 V8 that powers it has well-documented weaknesses. Valve stem seal failure is the defining issue, followed by oil leaks and cooling system problems. These are expensive to fix, but well-understood by specialists. If you're buying a 745i, budget for valve stem seal work (£2,500–£4,500) and cooling system maintenance (£500–£1,200). The reward is one of BMW's most refined V8s in one of the most comfortable cars ever made. Buy on history, maintain religiously, and the 745i will reward you.

Don't guess.Get the right engine at the right price.

→ Compare 745i engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare 745i engine prices before you buy

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Buying Checklist

Before you buy a used BMW 745i (or before you commit to an engine replacement), check these:

1. Cold Start

Any blue smoke? (valve stem seal warning - the most critical check on the N62)

2. Oil Consumption

How much oil does it use between services? (valve stem seal or oil leak warning)

3. Service History

including evidence of valve stem seal work and frequent oil changes

4. Oil Spots

Any oil under the car? (valve cover, timing cover, or alternator bracket leak warning)

5. Coolant Level

Any unexplained loss? (cooling system warning)

6. Temperature Gauge

Any history of overheating? (water pump or thermostat failure)

7. Engine Warning Light

Have codes been read? Any unresolved issues?

8. MOT History

Check for emissions-related failures (catalyst damage from oil burning)

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

BMW 320d Engine Codes

This table's rows match Section 1B's Era Map exactly - one engine throughout this badge's production run.

N62B44A

Years2001–2008

Power325–333 hp

2025 Enquiries[PATTERN DATA]

Avg. Recon Cost£3,500–£6,500 [BMW-QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N62B44A2001–2008325–333 hp[PATTERN DATA]£3,500–£6,500 [BMW-QUOTE]

Technical Specs

N62B44A

Displacement4,398 cc (4.4-litre)

CylindersV8

Compression Ratio10.0–10.5:1

Fuel SystemElectronic fuel injection (EFI)

ValvetrainDOHC, 4 valves per cylinder, Double-VANOS, Valvetronic

Block MaterialAluminium

Engine Weight213 kg

→ Compare 745i engine prices for your BMW

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Market Intelligence

Most Common Failure

Valve stem seal failure

the defining weakness of the N62 V8

Average Enquiry Mileage

90,000

–140,000 miles【PATTERN DATA】

Average Replacement Cost

£3,500

–£6,500 reconditioned, supply only【BMW-QUOTE】

Most Requested Engine Code

N62B44A

the 745i's 4.4-litre V8【PATTERN DATA】

Peak Enquiry Season

Spring

classic car and performance car season【PATTERN DATA】

Regional Demand

London20%

South East18%

South West (14%)【PATTERN DATA】

Regional Demand Breakdown

20%London

18%South East

BMW 320d - Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty - always confirm terms with your chosen supplier.

Trusted 745i Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 745i owners, as part of the Engine Finders network, across the E65/E66 generation.
Compare 745i Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who genuinely understand the N62's valve stem seals, oil leaks and cooling system nuances.
UK Engine Replacement Services for 745i
supply‑only or full supply & fit available nationwide, covering BMW's V8-powered 7 Series with a 12‑month warranty as standard.

Find the best BMW 745i engine replacement UK owners trust. Compare prices from trusted specialists on EnginesMarket today and keep your V8-powered 7 Series on the road.

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No hidden fees

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20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

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